Some of them do, most of them don’t. From what I know, for instance, Sungmin talks in formal speech to everyone who’s older than him (Kangin, Heechul, Leeteuk, Yesung). Shindong talks in formal speech to just Kangin and Heechul. Eunhyuk talks in formal speech to Leeteuk, Kangin and Heechul. Ryeowook talks in formal speech to just Heechul (sometimes… haha) and Kyuhyun talks in formal speech to just Leeteuk. And Donghae doesn’t talk in formal speech to anyone haha
140322, SJM “SWING” Presscon.
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